The issue of air pollution has been on our minds a lot in 2017. American cities are nothing like Delhi or Beijing, where toxic smog blankets the skyline and closes schools. But air quality is still very poor in far too many parts of the United States.

We’ve compiled some examples of how air pollution is affecting the lives of people from London, to Shanghai, to Los Angeles, to Delhi, to Salt Lake City and even more places in a Twitter Moment. Below is a sample of what we’ve pulled together:

Smog can sweep in like a wave. Or a faceless villain in a John Carpenter movie. As it did in Beijing on Jan. 2.

Everyone deserves clean air to breathe, and that’s why we believe it’s so important that America and the world transition to cleaner fuels. This is one of the many reasons we’re fighting to ensure Americans have a choice of cleaner burning fuels at the pump. We hope you’ll join us in this fight by making a donation today.

Air quality in the United States is far better than it once was: The EPA says that between 1970 (the year the agency was created, and the Clean Air Act made into law) and 2014, aggregate emissions of six common pollutants dropped by 69 percent.

It’s comforting for parents to know that all the most frightful aspects of Halloween — even candy corn — will be an afterthought come Nov. 1. All the candy will either be devoured, hidden away for rationing, or shipped off to the troops. Read more →

The newly elected mayor of London, Sadiq Khan, recently announced a new plan to fight air pollution. One of the biggest changes he intends to make is requiring owners of the worst-polluting cars pay a fee to drive in central London. Read more →